Quote:
Originally Posted by suspirit
Also when I short cut RX and TX I could see strange characters on Terminal so I think the USB-TTL adapter is fine.
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Wrong.
There should be nothing at all "strange" about the characters you see when Tx is looped back to Rx.
You need to give us the specifics of the adapter you are using.
Make and model number, OR
A link to where it is advertised so that we can research that part for you.